KR102285390B1 - Organic light emitting display apparatus - Google Patents

Abstract

According to an embodiment of the present invention, a plurality of pixels disposed in the display area, a plurality of dummy pixels disposed in the dummy area, and the plurality of dummy pixels may be connected to, and disposed connectably to the plurality of pixels. a plurality of repair lines, wherein each of the plurality of dummy pixels includes a compensating capacitive element, a driving transistor outputting a driving current corresponding to a data signal applied to a gate electrode, and a first electrode of the compensating capacitive element and a connection part connected between the gate electrode of the driving transistor and electrically connecting or disconnecting the first electrode of the compensation capacitive element and the gate electrode of the driving transistor according to an applied physical amount. A display device is disclosed.

Description

Organic light emitting display apparatus

An embodiment of the present invention relates to an organic light emitting diode display, particularly to an organic light emitting display to which a repair process through a dummy pixel may be applied.

A defect may occur in a pixel circuit of a specific pixel during a manufacturing process of an organic light emitting diode display. In this case, the pixel in which the defect has occurred may always emit light regardless of the scan signal and the data signal, or may be displayed in black. As described above, a pixel in which light is always emitted from a pixel is recognized as a bright spot (or a bright spot) by an observer, and a pixel displayed in black is recognized as a dark spot (or a dark spot) by the observer. In addition, as the circuit within the pixel becomes more complex, it becomes difficult to overcome the bright or dark spots by repairing the pixel circuit of the pixel having such a defect.

Embodiments of the present invention provide an organic light emitting diode display with improved image quality by allowing the defective pixel to be normally driven by repairing the defective pixel and by partially changing the circuit structure of the dummy pixel used after the repair process. would like to provide

According to an embodiment of the present invention, a plurality of pixels disposed in the display area, a plurality of dummy pixels disposed in the dummy area, and the plurality of dummy pixels may be connected to, and disposed to be connectable to the plurality of pixels. each of the plurality of repair lines, wherein each of the plurality of dummy pixels includes a compensation capacitive element, a driving transistor outputting a driving current corresponding to a data signal applied to a gate electrode, and a first of the compensation capacitive element and a connection part that can be connected between an electrode and the gate electrode of the driving transistor and electrically connects or disconnects the first electrode of the compensating capacitive element and the gate electrode of the driving transistor according to an applied physical amount Disclosed is a light emitting display device.

Each of the plurality of dummy pixels may be connected between an output node connected to a corresponding one of the plurality of repair lines and the driving transistor, and a light emission control transistor controlled by a light emission control signal, the output node, and the compensation Capacitive element initialization, which may be connected between the second electrode of the capacitive element, and which may be connected between a capacitance control transistor controlled by the light emission control signal, and between the capacitance control transistor and an initialization voltage line, and which is controlled by an initialization control signal. It may further include a transistor.

The connection part includes a first region connected to the first electrode of the compensation capacitive element and a second region connected to the gate electrode of the driving transistor, wherein the first region and the second region are electrically isolated from each other; , the first and second regions may be electrically connected by a laser.

The connection part includes a first region connected to the first electrode of the compensating capacitive element and a second region connected to the gate electrode of the driving transistor, wherein the first region and the second region are electrically connected to each other, , the first and second regions may be electrically cut off by a laser.

Each of the plurality of pixels may include a pixel circuit and a light emitting device detachably connected to the pixel circuit, and each of the plurality of dummy pixels may include a dummy circuit.

any one of the plurality of pixels includes a repair pixel, the repair pixel is separated from the pixel circuit of the repair pixel and a corresponding dummy of the plurality of dummy pixels is separated from the pixel circuit of the repair pixel through a corresponding repair line of the plurality of repair lines It may include a light emitting device connected to the dummy circuit of the pixel.

The plurality of pixels may include a first pixel and a second pixel, and the connection unit may be connected between an output node connected to a corresponding one of the plurality of repair lines and the driving transistor and controlled by an emission control signal. a first capacitance control transistor controlled by the light emission control signal, the first capacitance control transistor controlled by the light emission control signal, the compensation control node, and an initialization voltage line, and controlled by an initialization signal a capacitive element initialization transistor, and may be connected between the compensation control node and the second electrode of the compensation capacitive element, and when the repair pixel is the first pixel, the compensation control node and the second electrode of the compensation capacitive element and a second capacitance control transistor electrically connecting two electrodes and electrically disconnecting the compensation control node and the second electrode of the compensation capacitive element when the repair pixel is the second pixel.

The dummy circuit of the corresponding dummy pixel may provide a driving current to the light emitting device of the repair pixel through the corresponding repair line.

Another embodiment of the present invention provides first and second pixels disposed in a display area, a dummy pixel disposed in the dummy area and including a compensation capacitive element, and may be connected to the dummy pixel and may be connected to the first and second pixels. a repair line arranged to be connectable; Disclosed is an organic light emitting diode display including a connection part connected between the electrodes and electrically connecting or electrically disconnecting a first electrode of the compensation capacitive element and a gate electrode of the driving transistor according to an applied physical amount.

The dummy pixel may be connected between an output node connected to the repair line and the driving transistor, and may be connected between an emission control transistor controlled by an emission control signal, the output node, and the second electrode of the compensation capacitive element. and a capacitance control transistor controlled by the light emission control signal, and a capacitive element initialization transistor connected between the capacitance control transistor and the initialization voltage line and controlled by the initialization signal.

The connection part includes a first region connected to the first electrode of the compensation capacitive element and a second region connected to the gate electrode of the driving transistor, wherein the first region and the second region are electrically isolated from each other; , the first and second regions may be electrically connected by a laser.

The connection part includes a first region connected to the first electrode of the compensating capacitive element and a second region connected to the gate electrode of the driving transistor, wherein the first region and the second region are electrically connected to each other, , the first and second regions may be electrically cut off by a laser.

The first and second pixels may include a pixel circuit and a light emitting device detachably connected to the pixel circuit, and the dummy pixel may include a dummy circuit.

Any one of the first and second pixels may include a repair pixel, and the light emitting device of the repair pixel may be separated from the pixel circuit of the repair pixel and connected to the dummy circuit of the dummy pixel through the repair line.

The connection part may be connected between an output node connected to the repair line and the driving transistor, and may be connected to a light emission control transistor controlled by a light emission control signal, the output node, and a compensation control node, and may be connected by the light emission control signal a first capacitive control transistor to be controlled, a capacitive element initialization transistor connected between the compensation control node and an initialization voltage line and controlled by an initialization signal, and between the compensation control node and the second electrode of the compensation capacitive element and electrically connecting the compensation control node and the second electrode of the compensation capacitive element when the first pixel is the repair pixel, and the compensation control node and the second electrode when the second pixel is the repair pixel; and a second capacitance control transistor electrically disconnecting the second electrode of the compensating capacitive element.

The dummy circuit of the dummy pixel may provide a driving current to the light emitting device of the repair pixel through the repair line.

Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to embodiments of the present invention, the defective pixel can be normally driven by repairing the defective pixel, and the circuit structure of the dummy pixel used after the repair process can be partially changed to improve image quality. A display device may be provided.

1 is a diagram schematically illustrating an organic light emitting diode display according to an exemplary embodiment.
FIG. 2 is a diagram schematically illustrating an example of the display unit shown in FIG. 1 .
FIG. 3 is a view for explaining a method of repairing a defective pixel by using a repair line in the display unit shown in FIG. 2 .
FIG. 4 is a diagram schematically illustrating another example of the display unit shown in FIG. 1 .
5 is a circuit diagram illustrating a pixel according to an embodiment of the present invention.
6 is a circuit diagram illustrating a dummy pixel according to an embodiment of the present invention.
7 is a circuit diagram illustrating a dummy pixel according to another embodiment of the present invention.
8 is a circuit diagram illustrating a dummy pixel according to another exemplary embodiment of the present invention.
9 is a circuit diagram illustrating a dummy pixel according to another embodiment of the present invention.
10 is a timing diagram illustrating an operation by a dummy pixel according to another embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following embodiments, terms such as first, second, etc. are used for the purpose of distinguishing one component from another without limiting meaning. The singular expression includes the plural expression unless the context clearly dictates otherwise. The terms include or have means that a feature or element described in the specification is present, and does not preclude the possibility that one or more other features or elements will be added.

1 is a block diagram schematically illustrating an organic light emitting diode display according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , the organic light emitting diode display 100 may include a display unit 110 , a gate driver 120 , a source driver 130 , a control unit 140 , and a power supply unit 150 . The gate driver 120 , the source driver 130 , the control unit 140 , and the power supply unit 150 may be formed on separate semiconductor chips or integrated into one semiconductor chip. Also, the gate driver 120 and/or the source driver 130 may be formed on the same substrate as the display unit 110 . The organic light emitting diode display 100 may be, for example, a component for displaying an image of an electronic device such as a smart phone, a tablet PC, a notebook PC, a monitor, or a TV.

An active area (display area) AA and a dummy area DA may be defined in the display unit 110 . The dummy area DA may be disposed in the non-display area adjacent to the active area AA. The dummy area DA may be disposed on the left and/or right of the active area AA. According to another example, the dummy area DA may be disposed above and/or below the active area AA.

In the active area AA, a plurality of control lines CL1 to CLn extending in a first direction (eg, a row direction) and a plurality of data lines extending along a second direction (eg, a column direction) are provided in the active area AA. A plurality of pixels P connected to DL1 to DLm may be arranged. A plurality of dummy pixels DP each connected to a corresponding control line (eg, CLi) among the dummy data line DDL and the plurality of control lines CL1 to CLn may be arranged in the dummy area DA. The dummy pixels DP may be arranged along the second direction in the dummy area DA.

In FIG. 1 , the control lines CL1 to CLn are illustrated as one signal line for convenience, but each of the control lines CL1 to CLn may include a plurality of signal lines. For example, the first control line CL1 may include three lines to which the scan signal GW, the initialization control signal GI, and the emission control signal EM are applied.

The display unit 110 may include a plurality of repair lines RL1 to RLn extending parallel to the plurality of control lines CL1 to CLn. The repair lines RL1 to RLn may be connected to the dummy pixels DP and may be disposed to be connectable to the pixels P.

The unit pixel may include a plurality of sub-pixels each displaying a plurality of colors in order to display various colors. In this specification, the pixel P mainly means one sub-pixel. However, the present invention is not limited thereto, and the pixel P may mean one unit pixel including a plurality of sub-pixels. That is, although it is described herein that one pixel P exists, this may be interpreted as one sub-pixel being present, or a plurality of sub-pixels constituting one unit pixel may exist. . The same applies to the dummy pixel DP. For example, even though it is described that there is one dummy pixel, it may be interpreted that one dummy pixel exists, or that dummy sub-pixels exist as many as the number of sub-pixels constituting one unit pixel. . When the existence of one dummy pixel is interpreted as the existence of a plurality of dummy sub-pixels, the dummy data line connected to the dummy pixel should also be interpreted as including a plurality of dummy data lines respectively connected to the plurality of dummy sub-pixels. will be.

In this specification, the term "connectable" or "connectable" may mean a state that can be connected using a laser or the like in a repair process. For example, when the first member and the second member are arranged to be connectable, it may mean that the first member and the second member are not actually connected, but are in a state in which they can be connected to each other in the repair process. From a structural point of view, the first member and the second member "connectable" to each other may be disposed to cross each other with an insulating film therebetween in the overlapping region. When a laser is irradiated to the overlapping area in the repair process, the insulating layer in the overlapping area is destroyed, and the first member and the second member may be electrically connected to each other.

In addition, in this specification, the term "separable" or "separably" may mean a state that can be separated using a laser or the like in a repair process. For example, when the first member and the second member are detachably connected, it may mean that the first member and the second member are actually connected, but are in a state in which they can be separated in a repair process. From a structural point of view, the detachably connected first member and the second member may be arranged to be connected to each other through a conductive connecting member. When a laser is irradiated to the conductive connection member in the repair process, the conductive connection member may be cut while the laser-irradiated portion is melted, and the first member and the second member may be electrically insulated from each other. For example, the conductive connection member may include a silicon layer that can be melted by a laser. According to another example, the conductive connecting member may be cut while being melted by Joule heat caused by an electric current.

The display unit 110 may be connected to the dummy data line DDL and may include a connection line GL that is connected to the plurality of data lines DL1 to DLm. The connecting line GL may extend in the first direction. The connecting line GL may be disposed in a dead space outside the active area AA and the dummy area DA. The dead space may refer to an area in the display unit 110 in which the pixels P and the dummy pixels DP are not disposed. Since the connecting line GL is disposed in the dead space, the connecting line GL can be formed with a large design margin. For example, the connection line GL may have a wider width and/or thickness to lower resistance. A plurality of connecting lines GL may be disposed on the display unit 110 .

The gate driver 120 provides a plurality of control signals to the pixels P and the dummy pixels DP through the control lines CL1 to CLn, and the source driver 130 provides the data lines DL1 to DLm. A data signal may be provided to the pixels P through the 1 , the source driver 130 may not be directly connected to the dummy data line DDL. According to another example, the source driver 130 may be directly connected to the dummy data line DDL to directly provide a data signal to the dummy pixels DP.

The controller 140 may control the gate driver 120 , the source driver 130 , and the power supply unit 150 . The control unit 140 transmits a control signal and image data for controlling the gate driver 120 , the source driver 130 and/or the power supply unit 150 based on the horizontal synchronization signal and the vertical synchronization signal to the gate driver 120 , It may output to the source driver 130 and/or the power supply unit 150 . The power supply unit 150 applies the first driving voltage EVLDD, the second driving voltage ELVSS, the first initialization voltage VINIT1, and the second initialization voltage VINIT2 to the pixels P and/or the dummy pixel (P). DP) can be authorized. In this case, the first initialization voltage VINIT1 may be supplied to the pixels P, and the second initialization voltage VINIT2 may be supplied to the dummy pixels DP. The first initialization voltage VINIT1 and the second initialization voltage VINIT2 may be the same or different voltages.

The pixel P may include a light emitting device and a pixel circuit detachably connected to the light emitting device. The dummy pixel DP may include a dummy circuit. For example, when the pixel P shown in FIG. 1 is a bad pixel, the light emitting device of the bad pixel is separated from the pixel circuit of the bad pixel, and is a dummy through the corresponding repair line RLi among the repair lines RL1 to RLn. It may be connected to a corresponding dummy pixel DP among the pixels DP. Also, among the data lines DL1 to DLm, the data line DLj connected to the bad pixel may be connected to the dummy data line DDL through the connection line GL. The data signal applied to the bad pixel is applied to the dummy pixel DP through the data line DLj, the connection line GL connected to the data line DLj, and the dummy data line DDL connected to the connection line GL. The dummy pixel DP generates a driving current corresponding to the data signal and supplies the driving current to the light emitting device of the defective pixel through the repair line RLi. The light emitting element emits light having a brightness corresponding to the data signal. Accordingly, the light emitting device of the bad pixel operates normally by the dummy pixel DP.

As used herein, the terms “corresponding” or “correspondingly” may mean disposed in the same column or row, depending on the context. For example, when a first member is connected to a “corresponding” second member of the plurality of second members, it is meant to be connected to a second member disposed in the same column or same row as the first member.

FIG. 2 is a diagram schematically illustrating an example of the display unit shown in FIG. 1 .

Referring to FIG. 2 , the display unit 110 may include an active area AA that displays an image by light emission and a dummy area DA around the active area AA.

The pixels P arranged in the active area AA may include a pixel circuit C and a light emitting device E that emits light by receiving a driving current from the pixel circuit C. The light emitting device E and the pixel circuit C may be detachably connected to each other. The pixel circuit C may include one or more thin film transistors and a capacitive element. In this specification, the capacitive element may mean a capacitor. The pixel P may emit light of one color, for example, light of one color among red, blue, green, and white. However, the present invention is not limited thereto, and light of colors other than red, blue, green, and white may be emitted.

The light emitting device E of the pixel P may be insulated from the repair line in the same row, and may be electrically connected to the repair line in a subsequent repair process. That is, the light emitting device E of the pixel P may be disposed to be connectable to the repair line in the same row. For example, the light emitting device E may be electrically connected to the first connecting member 11 , and the first connecting member 11 may be formed to partially overlap the repair line with an insulating layer interposed therebetween. The first connection member 11 may include one or more conductive layers formed of a conductive material. In the repair process, when the laser is irradiated to the overlapping region of the first connecting member 11 and the repair line, the insulating layer is destroyed and the first connecting member 11 and the repair line are short-circuited to be electrically connected. Accordingly, the light emitting device E may be electrically connected to the repair line.

2 illustrates an example in which the dummy area DA is disposed on the left side of the active area AA and one dummy pixel DP is disposed in each row. A dummy data line DDL connected to the dummy pixels DP may be disposed in the dummy area DA. The dummy data line DDL may be disposed parallel to the data lines DL1 to DLm. The repair lines RL1 to RLn and the control lines CL1 to CLn may also extend to the dummy area DA.

The dummy pixel DP includes a dummy circuit DC and does not include a light emitting device. The dummy circuit DC may be the same as the pixel circuit C. According to another example, the dummy circuit DC may be different from the pixel circuit C. For example, in the dummy circuit DC, the transistor and/or the capacitive element of the pixel circuit C may be omitted and/or added, or the size and characteristics of the transistor and the capacitive element may be different from each other.

The connection line GL may be disposed outside the active area AA and the dummy area DA. The connection line GL and the data lines DL1 to DLm may be insulated from each other, and in a repair process, one of the connection line GL and the data lines DL1 to DLm may be electrically connected to each other. For example, the data lines DL1 to DLm may be disposed to partially overlap the connection line GL with an insulating layer interposed therebetween. In the repair process, when the laser is irradiated to the overlapping area of the data line and the connecting line GL connected to the bad pixel, the insulating layer is destroyed and the data line and the connecting line GL are shorted, so that the data line and the connecting line GL connected to the bad pixel are electrically connected to each other. can be connected

FIG. 3 is a view for explaining a method of repairing a defective pixel by using a repair line in the display unit shown in FIG. 2 .

Below, when a defect occurs in the pixel Pij connected to the i-th control line CLi and the j-th data line DLj among the pixels P formed in the active area AA, for example, the pixel Pij A case in which the pixel circuit C of ) is defective will be described as an example. In this example, the pixel Pij is referred to as a bad pixel Pij.

Referring to FIG. 3 , the light emitting device E of the bad pixel Pij may be separated from the pixel circuit C. As shown in FIG. For example, the light emitting device E of the bad pixel Pij may be separated from the pixel circuit C by irradiating a laser to the connection region between the light emitting device E and the pixel circuit C and cutting (CUT) it. .

Next, the light emitting device E of the bad pixel Pij and the dummy circuit DC of the dummy pixel DPi may be electrically connected to each other. To this end, the light emitting device E of the bad pixel Pij may be connected to the repair line RLi in the same row. For example, by irradiating a laser to the overlapping area of the repair line RLi in the same row with the first connection member 11 connected to the light emitting element E of the bad pixel Pij, the light emitting element E is formed with the repair line (RLi) may be electrically connected. Since the repair line RLi is connected to the dummy circuit DC, the light emitting device E of the bad pixel Pij may be connected to the dummy circuit DC of the dummy pixel DPi.

Next, the data line DLj connected to the bad pixel Pij and the dummy data line DDL may be electrically connected to each other. To this end, the data line DLj may be connected to the connection line GL. For example, the data line DLj and the connection line GL may be electrically connected to each other by irradiating a laser to the overlapping area of the data line DLj and the connection line GL. Since the connection line GL is connected to the dummy data line DDL, the data line DLj and the dummy data line DDL may be connected to each other.

The pixel circuit C of the bad pixel Pij and the dummy circuit DC of the dummy pixel DPi may simultaneously respond to a scan signal applied to the same scan line among the control lines CLi. Since the data line DLj connected to the pixel circuit C of the bad pixel Pij is connected to the dummy data line DDL through the connection line GL, data applied to the pixel circuit C of the bad pixel Pij is The signal Dj may also be applied to the dummy circuit DC of the dummy pixel DPi. The dummy circuit DC may generate a driving current Iij corresponding to the data signal Dj, and transmit the driving current Iij to the light emitting device E of the bad pixel Pij through the repair line RLi. can provide The light emitting device E of the bad pixel Pij may emit light with a brightness corresponding to the data signal Dj by the driving current Iij. Through this, the bad pixel Pij may be repaired into a normal pixel.

In this example, since the dummy data line DDL is connected to the data line DLj through the connection line GL, there is no need to separately drive the dummy data line DDL. Accordingly, there is no need to modify the source driver to drive the separate timing or dummy data line DDL, and the existing driver can be used as it is.

FIG. 4 is a diagram schematically illustrating another example of the display unit shown in FIG. 1 .

Referring to FIG. 4 , the display unit 210 is substantially the same as the display unit 110 illustrated in FIG. 2 , except for some differences. Hereinafter, the same description will be omitted and the differences will be mainly described. In addition, for easy understanding of the present embodiment, FIG. 4 shows only the bad pixels BPa and BPb without showing the normal pixel P, and also omits the control lines.

The display unit 210 may include a first dummy area DA1 disposed on the left side of the active area AA and a second dummy area DA2 disposed on the right side of the active area AA. A first dummy data line DDL1 and a plurality of first dummy pixels (eg, DPa) connected thereto may be disposed in the first dummy area DA1 . A second dummy data line DDL2 and a plurality of second dummy pixels (eg, DPb) connected thereto may be disposed in the second dummy area DA2 . The first dummy area DA1 and the second dummy area DA2 may correspond to the dummy area DA of FIG. 1 .

The active area AA may be divided into a first active area AA1 and a second active area AA2 . A first connection line GL1 connected to the first dummy data line DDL1 may be disposed above the first active area AA1 , and a second dummy data line DDL2 may be disposed above the second active area AA2 . A second connection line GL2 connected to ) may be disposed. The first connection line GL1 and the second connection line GL2 may be insulated from each other. The first connecting line GL1 and the second connecting line GL2 may be disposed below the first active area AA1 and the second active area AA2 . The data lines DLa on the first active area AA1 may be connected to the first connection line GL1 . The data lines DLb on the second active area AA2 may be connected to the second connection line GLW2 .

The display unit 210 includes first repair lines (eg, RLa) extending from the first dummy pixels DPa of the first dummy area DA1 onto the first active area AA1, and the second dummy area DA2 ) may include second repair lines (eg, RLb) extending from the second dummy pixels DPb onto the second active area AA2. The first repair lines RLa and the second repair lines RLb may be insulated from each other.

At least one bad pixel BPa on the first active area AA1 may be repaired using the first repair lines RLa, the first connection lines GL1 , and the first dummy data line DDL1 . . The plurality of bad pixels BPa positioned in the same column may be repaired together even if there are no additional connection lines and additional dummy data lines. The light emitting device E of the bad pixel BPa on the first active area AA1 is separated from the pixel circuit C and connected to the dummy circuit DC of the first dummy pixel DPa in the same row as the first repair line ( RLa) can be connected. The data line DLa connected to the bad pixel BPa may be connected to the first connection line GL1 , and the data signal applied to the data line DLa may also be applied to the dummy circuit DC. The dummy circuit DC may generate a driving current corresponding to the data signal, and may provide the driving current to the light emitting device E of the bad pixel BPa through the first repair line RLa, and the light emitting device E may emit light according to the driving current.

At least one bad pixel BPb on the second active area AA2 may be repaired using the second repair lines RLb, the second connection lines GL2 , and the second dummy data line DDL2 . . The light emitting device E of the bad pixel BPb on the second active area AA2 may be separated from the pixel circuit C, and may be connected to the second dummy circuit DC of the second dummy pixel DP2 in the same row. It may be connected through the repair line RLb. The data line DLb connected to the bad pixel BPb may be connected to the second connection line GL2 , and the data signal applied to the data line DLb may also be applied to the dummy circuit DC. The dummy circuit DC may generate a driving current corresponding to the data signal, and may provide the driving current to the light emitting device E of the bad pixel BPb through the second repair line RLb, and the light emitting device E may emit light according to the driving current.

According to the present exemplary embodiment, at least one bad pixel BPa on the first active area AA1 and at least one bad pixel BPb on the second active area AA2 may be repaired. In addition, according to the present embodiment, even if two bad pixels occur in the same row, repair can be performed.

The above-described embodiments have been described as an example of repair in which a bad pixel and a dummy pixel DP in the same row are connected by a repair line in the same row. However, the present invention is not limited thereto, and the same may be applied to a case in which a bad pixel is connected to a dummy pixel DP located in a different row and a repair line located in the same row as the bad pixel.

5 is a circuit diagram illustrating a pixel according to an embodiment of the present invention.

A pixel P illustrated in FIG. 5 is one of a plurality of pixels P included in an n-th row, and includes a scan line GWLn corresponding to the n-th row, a first initialization control line GILn, and light emission. They may be respectively connected to the control line EMLn to receive the scan signal GW[n], the first initialization control signal GI[n], and the emission control signal EM[n]. The pixel P may receive the second initialization control signal GB[n] through the second initialization control line corresponding to the n-th row.

The pixel P of the display device according to the present exemplary embodiment may include a pixel circuit C and an organic light emitting device that is connected to the pixel circuit C as a light emitting device E and emits light. The organic light emitting diode may include a pixel electrode (anode), a counter electrode (cathode), and a light emitting layer between the anode and the cathode.

The pixel circuit C includes a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4, an operation control transistor T5, a light emission control transistor T6, and a bypass transistor T7. and a storage capacitive element. The storage capacitive element may be a capacitor, and in this specification, the storage capacitive element may be expressed as a storage capacitor Cst1.

A gate electrode of the driving transistor T1 may be connected to the gate node Ng. The source electrode of the driving transistor T1 may be connected to the driving voltage line ELVDDL through the source node Ns and the operation control transistor T5 . The drain electrode of the driving transistor T1 may be electrically connected to the anode of the organic light emitting diode OLED through the drain node Nd and the emission control transistor T6 . A current flowing to the organic light emitting diode OLED is determined by a voltage difference between the gate electrode and the source electrode of the driving transistor T1 . The degree of light emission of the organic light emitting diode OLED may be determined by the amount of current flowing into the organic light emitting diode OLED.

A gate electrode of the switching transistor T2 may be connected to the scan line GWLn. A first electrode of the switching transistor T2 may be connected to the data line DL, and a second electrode of the switching transistor T2 may be connected to a source electrode of the driving transistor T1 . The switching transistor T2 is turned on according to the scan signal GW[n] transmitted through the scan line GWLn and transmits the data signal DATA transmitted through the data line DL to the source of the driving transistor T1 . The data signal DATA may be transmitted to the electrode and may be transmitted to the gate electrode of the driving transistor T1 by the compensation transistor T3 that is turned on at the same time.

A gate electrode of the compensation transistor T3 may be connected to the scan line GWLn. A first electrode of the compensation transistor T3 may be connected to a drain electrode of the driving transistor T1 , and a second electrode may be connected to the gate node Ng. The compensation transistor T3 is turned on according to the scan signal GW[n] received through the scan line GWLn to connect the gate electrode and the drain electrode of the driving transistor T1 to each other to connect the driving transistor T1. By diode-connecting, the threshold voltage Vth of the driving transistor T1 may be compensated.

A gate electrode of the initialization transistor T4 may be connected to the first initialization control line GILn. The first electrode of the initialization transistor T4 may be connected to the initialization voltage line IL, and the second electrode may be connected to the gate node Ng. The initialization transistor T4 is turned on according to the first initialization control signal GI[n] applied from the first initialization control line GILn to transmit the initialization voltage VINIT to the gate node Ng to the gate node (Ng) can be initialized. The initialization voltage VINIT may be set to a voltage higher than the second power voltage ELVSS or the second power voltage ELVSS.

A gate electrode of the operation control transistor T5 may be connected to the emission control line EMLn. A first electrode of the operation control transistor T5 may be connected to the driving voltage line ELVDDL, and a second electrode of the operation control transistor T5 may be connected to a source electrode of the driving transistor T1 .

A gate electrode of the emission control transistor T6 may be connected to the emission control line EMLn. A first electrode of the emission control transistor T6 may be connected to a drain electrode of the driving transistor T1 , and a second electrode may be electrically connected to the anode of the organic light emitting diode OLED through an output node No. The operation control transistor T5 and the emission control transistor T6 are simultaneously turned on according to the emission control signal EM[n] applied from the emission control line EMLn, so that the first power voltage ELVDD is applied to the driving transistor ( T1), a driving current may flow in the organic light emitting diode (OLED).

A gate electrode of the bypass transistor T7 may be connected to the second initialization control line. The first electrode of the bypass transistor T7 may be connected to the anode of the organic light emitting diode OLED through the output node No, and the second electrode may be connected to the initialization voltage line IL. The bypass transistor T7 may be turned on by the second initialization control signal GB[n] applied from the second initialization control line to initialize the anode of the organic light emitting diode OLED. The second initialization control signal GB[n] may be the same as or different from the first initialization control signal GI[n].

The storage capacitor Cst1 may be connected between the driving voltage line ELVDDL and the gate node Ng. A voltage between the first power voltage ELVDD and the gate node Ng may be stored in the storage capacitor Cst1 .

The anode of the organic light emitting diode OLED is connectable to the repair line RLn and is detachable from the pixel circuit C. The cathode of the organic light emitting diode OLED may be connected to a second power supply to which the second power voltage ELVSS is applied. The organic light emitting diode OLED receives a driving current from the driving transistor T1 and emits light to display an image. The first power voltage ELVDD may be a predetermined high level voltage, and the second power voltage ELVSS may be a voltage lower than the first power voltage ELVDD or a ground voltage.

Hereinafter, an operation process of the pixel P will be described. During the initialization period, the low-level first initialization control signal GI[n] may be supplied to the initialization transistor T4 through the first initialization control line GILn, and the low-level first initialization control signal GI[n] may be supplied through the second initialization control line. 2 The initialization control signal GB[n] may be supplied to the bypass transistor T7. As a result, the initialization transistor T4 and the bypass transistor T7 may be turned on, respectively. The initialization voltage VINIT applied from the initialization voltage line IL may be transmitted to the gate electrode of the driving transistor T1 through the initialization transistor T4 and may be transmitted to the anode through the bypass transistor T7 . Accordingly, the voltages of the gate electrode and the anode of the driving transistor T1 may be initialized.

Thereafter, during the data writing period, the low-level scan signal GW[n] may be supplied through the scan line GWLn, and the switching transistor T2 and the compensation transistor T3 may be turned on. The switching transistor T2 may transfer the data signal DATA from the data line DL to the source electrode of the driving transistor T1 , and the driving transistor T1 may be diode-connected by the compensation transistor T3 . Then, a compensation voltage that is reduced by the threshold voltage of the driving transistor T1 in the data signal DATA may be applied to the gate electrode of the driving transistor T1 .

A first power voltage ELVDD and a compensation voltage may be applied to both ends of the storage capacitor Cst1 , and a charge corresponding to a voltage difference between both ends may be stored in the storage capacitor Cst1 .

Thereafter, during the light emission period, the light emission control signal EM[n] supplied from the light emission control line EMLn may be changed from a high level to a low level, and the operation control transistor T5 and the light emission control transistor T6 are can be turned on. Then, a driving current may be generated according to a voltage difference between the voltage of the gate electrode of the driving transistor T1 and the first power voltage ELVDD, and the driving current may be transmitted to the organic light emitting diode OLED through the emission control transistor T6. supplied and can emit light.

6 is a circuit diagram illustrating a dummy pixel according to an embodiment of the present invention.

The dummy pixel DP1 illustrated in FIG. 6 may be a dummy pixel located in the n-th row. The dummy pixel DP1 is connected to the scan line GWLn, the first initialization control line GILn, and the emission control line EMLn corresponding to the n-th row, respectively, to obtain the n-th scan signal GW[n], n A th first initialization control signal GI[n] and an nth emission control signal EM[n] may be supplied.

The dummy pixel DP1 may include a dummy circuit DC1 , and the dummy circuit DC1 includes a driving transistor DT1 , a switching transistor DT2 , a compensation transistor DT3 , an initialization transistor DT4 , and an operation control transistor. DT5 , a light emission control transistor DT6 , a capacitance control transistor DT7 , a capacitive element initialization transistor DT8 , a storage capacitive element, and a compensation capacitive element. The storage capacitive element and the compensating capacitive element may be capacitors, and in this specification, the storage capacitive element may be expressed as a storage capacitor Cst2 and the compensating capacitive element may be expressed as a compensating capacitor Ccomp. The elements of the dummy circuit DC1 may have different sizes and capacities from those of the pixel circuit C.

The dummy circuit DC1 of the dummy pixel DP1 is mostly the same as the pixel circuit C of the pixel P shown in FIG. 5 except for some differences. Hereinafter, the same description will be omitted and the differences will be mainly described.

The gate electrode of the capacitance control transistor DT7 may be connected to the emission control line EMln to receive the emission control signal EM[n]. The first electrode of the capacitance control transistor DT7 may be connected to the repair line RLn through the output node DNo, and the second electrode may be connected to the compensation node DNc. The capacitance control transistor DT7 is turned on according to the emission control signal EM[n] to supply energy stored in the compensation capacitor Ccomp to the repair line RLn.

The gate electrode of the capacitive element initialization transistor DT8 may be connected to the second initialization control line to receive the second initialization control signal GB[n]. A first electrode of the capacitive element initialization transistor DT8 may be connected to the compensation node DNc, and a second electrode may be connected to the initialization voltage line IL. The capacitive element initialization transistor DT8 is turned on according to the second initialization control signal GB[n] to correspond to the difference between the first power supply voltage ELVDD and the initialization voltage VINIT in the compensation capacitor Ccomp. An initialization voltage VINIT may be supplied to the compensation capacitor Ccomp so that the amount of charge may be charged.

The first power voltage ELVDD and the voltage of the compensation node DNc may be applied to both ends of the compensation capacitor Ccomp, and a charge corresponding to the voltage difference between both ends may be stored in the compensation capacitor Ccomp.

The dummy pixel DP1 may not include the light emitting device E. However, the dummy pixel DP1 may include a light emitting device according to design. When the dummy pixel DP1 includes a light emitting element, the light emitting element may function as a circuit element without actually emitting light. For example, the light emitting device may function as one of capacitors included in the dummy pixel.

Hereinafter, an operation process of the dummy pixel DP1 will be described. During the initialization period, the low-level first initialization control signal GI[n] may be supplied to the initialization transistor DT4 through the first initialization control line GILn, and the low-level first initialization control signal GI[n] may be supplied through the second initialization control line. 2 The initialization control signal GB[n] may be supplied to the capacitive device initialization transistor DT8. As a result, the initialization transistor DT4 and the capacitive element initialization transistor DT8 may be turned on, respectively. The initialization voltage VINIT applied from the initialization voltage line IL may be transmitted to the gate electrode of the driving transistor DT1 through the initialization transistor DT4 and may be transmitted to the anode through the capacitive device initialization transistor DT8. there is. Accordingly, the gate electrode of the driving transistor DT1 may be initialized, and an amount of charge corresponding to the difference between the first power voltage ELVDD and the initialization voltage VINIT may be charged in the compensation capacitor Ccomp.

Thereafter, during the data writing period, the low-level scan signal GW[n] may be supplied through the scan line GWLn, and the switching transistor DT2 and the compensation transistor DT3 may be turned on. The switching transistor DT2 may transfer the data signal DATA from the data line DL to the source electrode of the driving transistor DT1 , and the driving transistor DT1 may be diode-connected by the compensation transistor DT3 . Then, a compensation voltage that is reduced by the threshold voltage of the driving transistor DT1 in the data signal DATA may be applied to the gate electrode of the driving transistor DT1 .

A first power voltage ELVDD and a compensation voltage may be applied to both ends of the storage capacitor Cst2 , and a charge corresponding to a voltage difference between both ends may be stored in the storage capacitor Cst2 .

Thereafter, during the light emission period, the light emission control signal EM[n] supplied from the light emission control line EMLn may be changed from a high level to a low level, and the operation control transistor DT5 and the light emission control transistor DT6 are can be turned on. Then, a driving current may be generated according to a voltage difference between the voltage of the gate electrode of the driving transistor DT1 and the first power voltage ELVDD, and the driving current may flow along the repair line RLn through the emission control transistor DT6 . It may be supplied to the organic light emitting diode (OLED) of the repair pixel. In this case, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the compensation capacitor Ccomp. That is, when the light emission control signal EM[n] is changed from the high level to the low level, the capacitance control transistor DT7 may be turned on, and energy due to the amount of charge charged in the compensation capacitor Ccomp is transferred to the output node ( DNo), and the amount of current supplied through the repair line RLn may be changed due to a change in the potential of the output node DNo.

The pixels P formed in the active area AA may have different electrical characteristics depending on the type of the pixel. For example, a case in which the pixels P include first and second pixels may be considered. In this case, in the first pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically long distance, so that a capacitance between the gate node Ng and the anode does not occur or is relatively small. Only a value capacitance may be generated, and in the second pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically close distance, so that the second pixels are relatively disposed between the gate node Ng and the anode. A large value of capacitance may be generated. In this case, when one of the first pixels becomes a repair pixel, the magnitude of the driving current supplied through the pixel circuit C of the corresponding pixel and the magnitude of the driving current supplied through the dummy circuit DC after the repair may be almost the same, but when one of the second pixels becomes a repair pixel, the magnitude of the driving current supplied through the pixel circuit C of the corresponding pixel and the amount of the driving current supplied through the dummy circuit DC after repair A difference may occur in the magnitude of the driving current. As a result, when the repair process is performed on the pixels included in the second pixels, a problem in which bright spots are generated in a high grayscale image may occur.

7 is a circuit diagram illustrating a dummy pixel according to another embodiment of the present invention.

The dummy circuit DC2 of the dummy pixel DP2 illustrated in FIG. 7 is mostly the same as the dummy circuit DC1 of the dummy pixel DP1 illustrated in FIG. 6 except for some differences. Hereinafter, the same description will be omitted and the differences will be mainly described.

The dummy circuit DC2 includes a driving transistor DT1, a switching transistor DT2, a compensation transistor DT3, an initialization transistor DT4, an operation control transistor DT5, a light emission control transistor DT6, and a capacitance control transistor DT7. , a capacitive element initialization transistor DT8, a storage capacitive element, a second compensation capacitive element, and a connection part.

The storage capacitive element and the second compensating capacitive element may be capacitors. In this specification, the storage capacitive element may be expressed as a storage capacitor Cst2 and the second compensating capacitive element may be expressed as a second compensating capacitor Ccomp2. there is. The second compensation capacitor Ccomp2 and the connection part may be connected in series between the gate node DNg and the compensation node DNc. For example, the first electrode of the connection part may be connected to the gate node DNg, the second electrode of the connection part may be connected to the first electrode of the second compensation capacitor Ccomp2, and the second compensation capacitor Ccomp2 The second electrode may be connected to the compensation node DNc. In this case, the capacitance of the second compensation capacitor Ccomp2 may correspond to the capacitance generated between the gate node Ng of the pixels P formed in the active area AA and the anode of the organic light emitting diode OLED.

The dummy circuit DC2 may include a first compensation capacitive element. The first and second compensation capacitive elements may be capacitors, and in this specification, the first compensation capacitive element may be expressed as a first compensation capacitor Ccomp1. The first power voltage ELVDD and the voltage of the compensation node DNc may be applied to both ends of the first compensation capacitor Ccomp1 , and a charge corresponding to the voltage difference between both ends may be stored in the first compensation capacitor Ccomp1 . there is.

The connection part may electrically connect or disconnect the first electrode of the second compensation capacitor Ccomp2 and the gate node DNg according to an applied physical amount. For example, the first electrode and the second electrode of the connection part may be electrically disconnected from each other, and may be a connection element SO that can be connected to each other when a physical quantity is applied with a laser or the like.

Hereinafter, an operation process of the dummy pixel DP2 will be described. During the initialization period, the low-level first initialization control signal GI[n] may be supplied to the initialization transistor DT4 through the first initialization control line GILn, and the low-level first initialization control signal GI[n] may be supplied through the second initialization control line. 2 The initialization control signal GB[n] may be supplied to the capacitive device initialization transistor DT8. As a result, the initialization transistor DT4 and the capacitive element initialization transistor DT8 may be turned on, respectively. The initialization voltage VINIT applied from the initialization voltage line IL may be transmitted to the gate electrode of the driving transistor DT1 through the initialization transistor DT4 and may be transmitted to the anode through the capacitive device initialization transistor DT8. there is. Accordingly, the gate electrode of the driving transistor DT1 may be initialized, and an amount of charge corresponding to the difference between the first power voltage ELVDD and the initialization voltage VINIT may be charged in the first compensation capacitor Ccomp1 .

Thereafter, during the data writing period, the low-level scan signal GW[n] may be supplied through the scan line GWLn, and the switching transistor DT2 and the compensation transistor DT3 may be turned on. The switching transistor DT2 may transfer the data signal DATA from the data line DL to the source electrode of the driving transistor DT1 , and the driving transistor DT1 may be diode-connected by the compensation transistor DT3 . Then, a compensation voltage that is reduced by the threshold voltage of the driving transistor DT1 in the data signal DATA may be applied to the gate electrode of the driving transistor DT1 .

A first power voltage ELVDD and a compensation voltage may be applied to both ends of the storage capacitor Cst2 , and a charge corresponding to a voltage difference between both ends may be stored in the storage capacitor Cst2 .

Thereafter, during the light emission period, the light emission control signal EM[n] supplied from the light emission control line EMLn may be changed from a high level to a low level, and the operation control transistor DT5 and the light emission control transistor DT6 are can be turned on. Then, a driving current may be generated according to a voltage difference between the voltage of the gate electrode of the driving transistor DT1 and the first power voltage ELVDD, and the driving current may flow along the repair line RLn through the emission control transistor DT6 . It may be supplied to the organic light emitting diode (OLED) of the repair pixel. In this case, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the first compensation capacitor Ccomp1. That is, when the emission control signal EM[n] is changed from the high level to the low level, the capacitance control transistor DT7 may be turned on, and energy by the amount of charge charged in the first compensation capacitor Ccomp1 is output. It may be supplied to the node DNo, and the amount of current supplied through the repair line RLn may be changed due to a change in the potential of the output node DNo. Also, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the second compensation capacitor Ccomp2 according to the state of the connection element SO. When the first and second electrodes of the connection element SO are electrically disconnected from each other because a special physical quantity is not applied to the connection element SO, the second compensation capacitor Ccomp2 is supplied through the repair line RLn. It may not affect the amount of current. On the other hand, when a laser is applied to the first and second electrodes of the connection element SO to be electrically connected to each other, when the capacitance control transistor DT7 is turned on, the amount of charge charged in the second compensation capacitor Ccomp2 is Energy may be supplied to the output node DNo, and the amount of current supplied through the repair line RLn may be changed due to a potential change of the output node DNo.

The amount of current flowing through the organic light emitting diode OLED of the repair pixel may be adjusted after the repair process by changing the shape of the connection part or the repair signal by using the dummy circuit DC2 illustrated in FIG. 7 . For example, a case in which the pixels P include first and second pixels may be considered. In this case, in the first pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically long distance, so that a capacitance between the gate node Ng and the anode does not occur or is relatively small. Only a value capacitance may be generated, and in the second pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically close distance, so that the second pixels are relatively disposed between the gate node Ng and the anode. A large value of capacitance may be generated. In this case, when one of the first pixels becomes the repair pixel, the dummy circuit DC2 may be configured such that the first and second terminals of the connection element SO are opened. Also, when one of the second pixels becomes a repair pixel, the dummy circuit DC2 may be configured such that the first and second terminals of the connection element SO are short-circuited. As a result, even when the pixel to which the repair process is applied is any of the first and second pixels, the amount of the driving current supplied through the pixel circuit C of the corresponding pixel and the dummy circuit DC after the repair The magnitude of the supplied driving current may be substantially the same.

8 is a circuit diagram illustrating a dummy pixel according to another exemplary embodiment of the present invention.

The dummy circuit DC3 of the dummy pixel DP3 shown in FIG. 8 is mostly the same as the dummy circuit DC2 of the dummy pixel DP2 shown in FIG. 7 except for some differences. Hereinafter, the same description will be omitted and the differences will be mainly described.

The dummy circuit DC3 includes a driving transistor DT1 , a switching transistor DT2 , a compensation transistor DT3 , an initialization transistor DT4 , an operation control transistor DT5 , a light emission control transistor DT6 , and a capacitance control transistor DT7 . , a capacitive element initialization transistor DT8 , a storage capacitive element, a first compensation capacitive element, a second compensation capacitive element, and a connection part. The storage capacitive element, the first compensating capacitive element, and the second compensating capacitive element may be capacitors, wherein the storage capacitive element is the storage capacitor Cst2 and the first compensating capacitive element is the first compensation As the capacitor Ccomp1 , the second compensation capacitive element may be represented by a second compensation capacitor Ccomp2 . In this case, the capacitance of the second compensation capacitor Ccomp2 may correspond to the capacitance generated between the gate node Ng of the pixels P formed in the active area AA and the anode of the organic light emitting diode OLED.

The connection part may electrically connect or disconnect the first electrode of the second compensation capacitor Ccomp2 and the gate node DNg according to an applied physical amount. The first electrode and the second electrode of the connection part may be electrically connected to each other, and may be a connection element SO that may be disconnected from each other when a physical quantity is applied with a laser or the like. For example, the connection part may be a polysilicon resistor PR. In this case, the first electrode and the second electrode that are both ends of the polysilicon resistor PR when no special physical quantity is applied are electrically connected to each other, but the polysilicon resistor PR is cut by heating with a laser to cut the polysilicon resistor. The first electrode and the second electrode of the resistor PR may be electrically disconnected from each other.

Before the emission control signal EM[n] supplied from the emission control line EMLn is changed from the high level to the low level during the operation of the dummy pixel DP3 of FIG. 8 , the dummy pixel P2 of FIG. Since the operation process is the same, the subsequent steps will be described. During the light emission period, the light emission control signal EM[n] supplied from the light emission control line EMLn may change from a high level to a low level, and the operation control transistor DT5 and the light emission control transistor DT6 turn- can be turned on Then, a driving current may be generated according to a voltage difference between the voltage of the gate electrode of the driving transistor DT1 and the first power voltage ELVDD, and the driving current may flow along the repair line RLn through the emission control transistor DT6 . It may be supplied to the organic light emitting diode (OLED) of the repair pixel. In this case, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the first compensation capacitor Ccomp1. That is, when the emission control signal EM[n] is changed from the high level to the low level, the capacitance control transistor DT7 may be turned on, and energy by the amount of charge charged in the first compensation capacitor Ccomp1 is output. It may be supplied to the node DNo, and the amount of current supplied through the repair line RLn may be changed due to a change in the potential of the output node DNo. Also, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the second compensation capacitor Ccomp2 according to the connection state of the polysilicon resistor PR. When the first and second electrodes of the connection element SO are electrically connected to each other because a special physical quantity is not applied to the polysilicon resistor PR, when the capacitance control transistor DT7 is turned on, the second compensation capacitor Energy by the amount of charge charged in Ccomp2 may be supplied to the output node DNo, and the amount of current supplied through the repair line RLn may be changed due to a change in potential of the output node DNo. . On the other hand, when the laser is applied to the first and second electrodes of the connection element SO to electrically disconnect them from each other, the second compensation capacitor Ccomp2 may not affect the amount of current supplied through the repair line RLn. there is.

The amount of current flowing through the organic light emitting diode OLED of the repair pixel may be adjusted after the repair process by changing the shape of the connection part or the repair signal by using the dummy circuit DC3 illustrated in FIG. 8 . For example, a case in which the pixels P include first and second pixels may be considered. In this case, in the first pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically long distance, so that a capacitance between the gate node Ng and the anode does not occur or is relatively small. Only a value capacitance may be generated, and in the second pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically close distance, so that the second pixels are relatively disposed between the gate node Ng and the anode. A large value of capacitance may be generated. In this case, when one of the first pixels becomes a repair pixel, the dummy circuit DC3 may be configured such that the first and second terminals of the polysilicon resistor PR are opened. Also, when one of the second pixels becomes a repair pixel, the dummy circuit DC3 may be configured such that the first and second terminals of the polysilicon resistor PR are short-circuited. As a result, even when the pixel to which the repair process is applied is any of the first and second pixels, the amount of the driving current supplied through the pixel circuit C of the corresponding pixel and the dummy circuit DC after the repair The magnitude of the supplied driving current may be substantially the same.

9 is a circuit diagram illustrating a dummy pixel according to another exemplary embodiment of the present invention.

The dummy circuit DC4 of the dummy pixel DP4 shown in FIG. 9 is mostly the same as the dummy circuit DC2 of the dummy pixel DP2 shown in FIG. 7 except for some differences. Hereinafter, the same description will be omitted and the differences will be mainly described.

The dummy circuit DC4 includes a driving transistor DT1 , a switching transistor DT2 , a compensation transistor DT3 , an initialization transistor DT4 , an operation control transistor DT5 , a light emission control transistor DT6 , and a first capacitance control transistor DT7), capacitive element initialization transistor DT8, second capacity control transistor DT9, third capacity control transistor DT10, storage capacitive element, first compensating capacitive element, second compensating capacitive element, holding (holding) may include a capacitive element. The storage capacitive element, the first compensating capacitive element, the second compensating capacitive element, and the holding capacitive element may be capacitors, wherein the storage capacitive element is the storage capacitor Cst2, and the first compensating capacitive element The device may be represented by a first compensation capacitor Ccomp1 , the second compensation capacitive device may be represented by a second compensation capacitor Ccomp2 , and the storage capacitive device may be represented by a storage capacitor Chold. In this case, the capacitance of the second compensation capacitor Ccomp2 may correspond to the capacitance generated between the gate node Ng of the pixels P formed in the active area AA and the anode of the organic light emitting diode OLED.

The second compensation capacitor Ccomp2 and the second capacitance control transistor DT9 may be connected in series between the gate node DNg and the compensation node DNc. For example, the first electrode of the second compensation capacitor Ccomp2 may be connected to the gate node DNg, and the second electrode of the second compensation capacitor Ccomp2 is the first electrode of the second capacitance control transistor DT9. may be connected to , and a second electrode of the second capacitance control transistor DT9 may be connected to the first compensation node DNc1 . The gate electrode of the second capacitance control transistor DT9 may be supplied with the voltage of the second compensation node DNc2 .

The gate electrode of the third capacitance control transistor DT10 may be connected to the scan line GWLn to receive the scan signal GW[n]. A first electrode of the third capacitance control transistor DT10 may be connected to a line to which the repair signal REP is supplied, and a second electrode of the third capacitance control transistor DT10 may be connected to the second compensation node DNc2 .

The first power supply voltage ELVDD and the voltage of the second compensation node DNc2 may be applied to both ends of the holding capacitor Chold, and a charge corresponding to the voltage difference between both ends may be stored in the holding capacitor Ccomp.

Until the emission control signal EM[n] supplied from the emission control line EMLn is changed from the high level to the low level during the operation of the dummy pixel DP4 of FIG. 9 , the dummy pixel P2 of FIG. Since the operation process is the same, the subsequent steps will be described. During the light emission period, the light emission control signal EM[n] supplied from the light emission control line EMLn may change from a high level to a low level, and the operation control transistor DT5 and the light emission control transistor DT6 turn- can be turned on Then, a driving current may be generated according to a voltage difference between the voltage of the gate electrode of the driving transistor DT1 and the first power voltage ELVDD, and the driving current may flow along the repair line RLn through the emission control transistor DT6 . It may be supplied to the organic light emitting diode (OLED) of the repair pixel. In this case, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the first compensation capacitor Ccomp1. That is, when the emission control signal EM[n] is changed from the high level to the low level, the first capacitance control transistor DT7 may be turned on, and energy by the amount of charge charged in the first compensation capacitor Ccomp1 may be supplied to the output node DNo, and the amount of current supplied through the repair line RLn may change due to a change in the potential of the output node DNo. Also, the current supplied to the organic light emitting diode OLED of the repair pixel may be increased or decreased by the energy charged in the second compensation capacitor Ccomp2 according to the state of the second capacitance control transistor DT9 . That is, when the level of the voltage of the second compensation node DNc2 is the high level, the high level voltage may be supplied to the gate terminal of the second capacitance control transistor DT9 and the second compensation capacitor Ccomp2 is repaired. The amount of current supplied through the line RLn may not be affected. On the other hand, when the level of the voltage of the second compensation node DNc2 is the low level, the low level voltage may be supplied to the gate terminal of the second capacitance control transistor DT9 and the second capacitance control transistor DT9 is can be turned on. As a result, energy due to the amount of charge charged in the second compensation capacitor Ccomp2 can be supplied to the output node DNo, and is supplied through the repair line RLn due to a potential change of the output node DNo. The amount of current can be changed. In this case, the level of the voltage of the second compensation node DNc2 that affects the turn-on of the second capacitance control transistor DT9 may be determined by the repair signal REP.

The amount of current flowing through the organic light emitting diode OLED of the repair pixel may be adjusted after the repair process by changing the shape of the connection part or the repair signal by using the dummy circuit DC4 illustrated in FIG. 9 . For example, a case in which the pixels P include first and second pixels may be considered. In this case, in the first pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically long distance, so that a capacitance between the gate node Ng and the anode does not occur or is relatively small. Only a value capacitance may be generated, and in the second pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically close distance, so that the second pixels are relatively disposed between the gate node Ng and the anode. A large value of capacitance may be generated. At this time, when one of the first pixels becomes the repair pixel, the repair signal REP may be set to a signal having a high level, so that the second capacitance control transistor DT9 is always turned off. A repair signal REP may be set. Also, when one of the second pixels becomes a repair pixel, the repair signal REP is set to have a low level whenever image data corresponding to the repair pixel is output, so that the second capacitance control transistor DT9 may set the repair signal REP to be turned on at every corresponding moment. As a result, even when the pixel to which the repair process is applied is any of the first and second pixels, the amount of the driving current supplied through the pixel circuit C of the corresponding pixel and the dummy circuit DC after the repair The magnitude of the supplied driving current may be substantially the same.

10 is a timing diagram illustrating an operation by a dummy pixel according to the exemplary embodiment of FIGS. 7 to 9 .

Referring to FIG. 10 , from a first time TM1 when the emission control signal EM[n] transitions from the low level to the high level, the emission control signal EM[n] transitions from the high level to the low level first time TM1 . The scan signal EM[n], the first initialization control signal GI[n], and the second initialization control signal GB[n] may transition several times during 5 times TM5, whereby the repair Voltage levels of the active anode of the pixel, the output node DNo to which the repair line RLn is connected, the compensation node DNc, and the gate node DNg may change.

First, the light emission control signal EM[n] transitions from the low level to the high level at the first time TM1 , and a period in which the organic light emitting diode OLED does not emit light may start.

Thereafter, at a second time TM2 , the first initialization control signal GI[n] and the second initialization control signal GB[n] transition from the high level to the low level, and thus the gate electrode of the driving transistor DT1 The over-compensation node DNc may be initialized to the initialization voltage VINIT. Thereafter, at a third time TM3 , the first initialization control signal GI[n] and the second initialization control signal GB[n] may transition from the low level to the high level. The change of the first initialization control signal GI[n] and the second initialization control signal GB[n] as in the second time TM2 and the third time TM3 may be repeatedly generated several times. . For example, the first initialization control signal GI[n] and the second initialization control signal GB[n] as in the second time TM2 transition from the high level to the low level at the fourth time TM4 ) can occur in the same way. In this case, a drop (-ΔBoostV) of the voltage level of the repair line RLn may occur due to a coupling effect due to a drop of the voltage level of the active anode of the repair pixel. Also, when the second initialization control signal GB[n] transitions from the high level to the low level, the level of the voltage of the repair line RLn due to a coupling effect caused by the drop of the level of the voltage of the second initialization control line may occur, and when the second initialization control signal GB[n] transitions from a low level to a high level, due to a coupling effect caused by a rise in the level of the voltage of the second initialization control line A rise ΔGBC of the level of the voltage of the repair line RLn may occur.

Thereafter, at a fifth time TM5 , the light emission control signal EM[n] may transition from the high level to the low level, and a light emission period may start. In this case, the potential of the active anode of the repair pixel may increase by a voltage corresponding to the data voltage. At this time, energy due to the amount of charge charged in the first compensation capacitor Ccomp1 may be supplied to the output node DNo, and accordingly, an increase ΔComp1 of the voltage of the repair line RLn may occur. . In addition, when the first electrode of the second compensation capacitor Ccomp2 and the gate electrode of the driving transistor DT1 are electrically connected, energy by the charge amount charged in the second compensation capacitor Ccomp2 is transferred to the output node DNo ), and accordingly, an increase ΔComp2 of the voltage of the repair line RLn may occur.

Through this, after the circuit of the pixel to which the repair process is applied, the amount of current output through the repair line RLn may be adjusted according to the circuit structure of the repair pixel. For example, the pixels P include first and second pixels, and in the first pixels, the gate node Ng of each pixel and the anode of the organic light emitting diode OLED are formed at a physically long distance from each other to form gates. These are pixels in which no capacitance or only a relatively small capacitance is generated between the node Ng and the anode, and the second pixels are physically close to the gate node Ng of each pixel and the anode of the organic light emitting diode OLED. A case in which the pixels are formed at a distance and generate a relatively large capacitance between the gate node Ng and the anode may be considered. At this time, when one of the first pixels becomes the repair pixel, the first electrode of the second compensation capacitor Ccomp2 and the gate electrode of the driving transistor DT1 may be electrically disconnected, and accordingly, 2 It is possible to prevent the compensation capacitor Ccomp2 from affecting the level of the voltage of the repair line RLn. Also, when one of the second pixels becomes a repair pixel, the first electrode of the second compensation capacitor Ccomp2 and the gate electrode of the driving transistor DT1 may be electrically connected to each other, and accordingly, the second Energy by the amount of charge charged in the compensation capacitor Ccomp2 is supplied to the output node DNo, so that the level of the voltage of the repair line RLn is increased ΔComp2 . As a result, in the organic light emitting diode display 100 on which the dummy pixel DP is disposed according to the present invention, when the repair process is not applied, when the repair process is applied to one of the first pixels, or the second In any case in which the repair process is applied to one of the pixels, when the image data is the same, the amount of current output to the organic light emitting diode (OLED) may be maintained at substantially the same level.

In the specification of the present invention (especially in the claims), the use of the term "above" and similar referential terms may be used in both the singular and the plural. In addition, when a range is described in the present invention, each individual value constituting the range is described in the detailed description of the invention as including the invention to which individual values belonging to the range are applied (unless there is a description to the contrary). same as

The steps constituting the method according to the present invention may be performed in an appropriate order, unless there is an explicit order or description to the contrary. The present invention is not necessarily limited to the order in which the steps are described. The use of all examples or exemplary terms (eg, etc.) in the present invention is merely for the purpose of describing the present invention in detail, and the scope of the present invention is limited by the examples or exemplary terms unless defined by the claims. it's not going to be In addition, those skilled in the art will appreciate that various modifications, combinations, and changes may be made in accordance with design conditions and factors within the scope of the appended claims or their equivalents.

In the present specification, the present invention has been described with reference to limited embodiments, but various embodiments are possible within the scope of the present invention. In addition, although not described, it will be said that equivalent means are also combined with the present invention as it is. Therefore, the true scope of protection of the present invention should be defined by the following claims.

100: organic light emitting display device
110: display unit
120: gate driver
130: source driver
140: control unit
150: power supply

Claims (16)

a plurality of pixels disposed in the display area;
a plurality of dummy pixels disposed in the dummy area; and
a plurality of repair lines connected to the plurality of dummy pixels and arranged to be connectable to the plurality of pixels;
Each of the plurality of dummy pixels,
compensating capacitive element;
a driving transistor outputting a driving current corresponding to a data signal applied to the gate electrode; and
may be connected between the first electrode of the compensating capacitive element and the gate electrode of the driving transistor, and may electrically connect or electrically connect the first electrode of the compensating capacitive element and the gate electrode of the driving transistor according to an applied physical amount An organic light emitting diode display including; a disconnecting part. The method of claim 1 , wherein each of the plurality of dummy pixels comprises:
a light emission control transistor connected between an output node connected to a corresponding one of the plurality of repair lines and the driving transistor and controlled by a light emission control signal;
a capacitance control transistor connected between the output node and the second electrode of the compensation capacitive element and controlled by the light emission control signal; and
and a capacitive element initialization transistor connected between the capacitance control transistor and an initialization voltage line and controlled by an initialization control signal. According to claim 1, wherein the connection portion,
a first region connected to a first electrode of the compensating capacitive element; and
a second region connected to the gate electrode of the driving transistor;
The first and second regions may be electrically isolated from each other, and the first and second regions may be electrically connected to each other by a laser. According to claim 1, wherein the connection portion,
a first region connected to a first electrode of the compensating capacitive element; and
a second region connected to the gate electrode of the driving transistor;
The first and second regions may be electrically connected to each other, and the first and second regions may be electrically disconnected by a laser. According to claim 1,
Each of the plurality of pixels includes a pixel circuit and a light emitting device detachably connected to the pixel circuit,
Each of the plurality of dummy pixels includes a dummy circuit. 6. The method of claim 5,
any one of the plurality of pixels includes a repair pixel,
and the repair pixel includes a light emitting element separated from a pixel circuit of the repair pixel and connected to a dummy circuit of a corresponding one of the plurality of dummy pixels through a corresponding one of the plurality of repair lines. Device. 7. The method of claim 6,
The plurality of pixels includes a first pixel and a second pixel,
The connection part,
a light emission control transistor connected between an output node connected to a corresponding one of the plurality of repair lines and the driving transistor and controlled by a light emission control signal;
a first capacitance control transistor connected to the output node and the compensation control node and controlled by the emission control signal;
a capacitive element initialization transistor connected between the compensation control node and an initialization voltage line and controlled by an initialization signal; and
may be connected between the compensation control node and the second electrode of the compensation capacitive element, and when the repair pixel is the first pixel, electrically connect the compensation control node and the second electrode of the compensation capacitive element; and a second capacitance control transistor electrically disconnecting the compensation control node and the second electrode of the compensation capacitive element when the repair pixel is the second pixel. 7. The method of claim 6,
and the dummy circuit of the corresponding dummy pixel provides a driving current to the light emitting element of the repair pixel through the corresponding repair line. first and second pixels disposed in the display area;
a dummy pixel disposed in the dummy region and including a compensating capacitive element; and
a repair line connected to the dummy pixel and arranged to be connectable to the first and second pixels;
The dummy pixel is
a driving transistor outputting a driving current corresponding to a data signal applied to the gate electrode; and
may be connected between the first electrode of the compensating capacitive element and the gate electrode of the driving transistor, and may electrically connect or electrically connect the first electrode of the compensating capacitive element and the gate electrode of the driving transistor according to an applied physical amount An organic light emitting diode display including; a disconnecting part. 10. The method of claim 9, wherein the dummy pixel,
a light emission control transistor connected between an output node connected to the repair line and the driving transistor, the light emission control transistor being controlled by a light emission control signal;
a capacitance control transistor connected between the output node and the second electrode of the compensation capacitive element and controlled by the light emission control signal; and
and a capacitive element initialization transistor connected between the capacitance control transistor and an initialization voltage line and controlled by an initialization signal. 10. The method of claim 9, wherein the connecting portion,
a first region connected to a first electrode of the compensating capacitive element; and
a second region connected to the gate electrode of the driving transistor;
The first and second regions may be electrically isolated from each other, and the first and second regions may be electrically connected to each other by a laser. 10. The method of claim 9, wherein the connecting portion,
a first region connected to a first electrode of the compensating capacitive element; and
a second region connected to the gate electrode of the driving transistor;
The first and second regions may be electrically connected to each other, and the first and second regions may be electrically disconnected by a laser. 10. The method of claim 9,
The first and second pixels include a pixel circuit and a light emitting device detachably connected to the pixel circuit,
and the dummy pixel includes a dummy circuit. 14. The method of claim 13,
any one of the first and second pixels includes a repair pixel;
The light emitting device of the repair pixel is separated from the pixel circuit of the repair pixel and connected to the dummy circuit of the dummy pixel through the repair line. 15. The method of claim 14, wherein the connecting portion,
a light emission control transistor connected between an output node connected to the repair line and the driving transistor, the light emission control transistor being controlled by a light emission control signal;
a first capacitance control transistor connected to the output node and the compensation control node and controlled by the emission control signal;
a capacitive element initialization transistor connected between the compensation control node and an initialization voltage line and controlled by an initialization signal; and
may be connected between the compensation control node and the second electrode of the compensation capacitive element, and when the first pixel is the repair pixel, electrically connect the compensation control node and the second electrode of the compensation capacitive element; and a second capacitance control transistor electrically disconnecting the compensation control node and the second electrode of the compensation capacitive element when the second pixel is a repair pixel. 15. The method of claim 14,
The dummy circuit of the dummy pixel provides a driving current to the light emitting element of the repair pixel through the repair line.

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